Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f56ebe5a05467c…

MALICIOUS

PDF

86.1 KB Created: 2021-04-19 19:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3680022efeeedadf2c279d527b0390da SHA-1: aa3a9c20120d43fdd3a9780b185d0856897441e9 SHA-256: 50f56ebe5a05467cadedc6f81cd0d367914a809ab63c085795222d8553ffdef8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Ejemplos de diagramas de flujo con algoritmos', likely to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=ejemplos+de+diagramas+de+flujo+con+algoritmos In PDF document text
    • http://monubagujizud.mywebcommunity.org/adyashanti_emptiness_dancing.pdfIn PDF document text
    • http://ionatr.space/gedavirazuvelabilevbn50.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/2644246.pdfIn PDF document text
    • http://pl50off.info/what_are_thinking_mapsuhfl1.pdfIn PDF document text
    • http://toreret.scienceontheweb.net/43709111078.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/53e6149b802.pdfIn PDF document text
    • http://zuzavepojul.mygamesonline.org/905944212.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/97169441875ytgsw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/081d0319-6258-4cfc-a84f-dd58dc294747/how_to_silence_your_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/80541005162.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_b8d2a5a795184977bd3c1d3928195181.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/churchill_insurance_pet_claim_form.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_1ff09b287dfe4a04806a779147f37029.pdf?index=trueIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_ca320ff88d6b403980dab654e9f7ac9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/57403865155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338f590b-6e4d-49d5-b8cc-c666a2d74a04/segefulisaneru.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/can_you_learn_physics_on_your_own.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e593eaf-82d6-482f-bade-1167690aba0f/onn_tv_code_for_verizon_remote.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/abrsm_grade_1_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/40059962544.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_cc6c1fe6b7484eea86b1ff686995f301.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 5508 bytes
SHA-256: 585787122090fc4d6e740583fc7fb4e3c58b14009c107a1eae6d03cd670b47d0
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 11596 bytes
SHA-256: 6f9fe92184e9ef2875bf3aee653187e4be2123c6a07a14588e40bc598a96826c
font_02_sfnt_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 16416 bytes
SHA-256: 5d342e1626fdb736477a9c5eb000da41113eee2fa679314e6dd10b573f4edd0c

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